Ments



W. S. PFEIF ER March STARTING DEVICE FOR SYNCHRONOUS MOTORS 2 SheetZs-Sheet 2 Original P1 ed Dec.

W, Wma V i.

www i@ (Reinued Mu. 17, 1931 Relaooo UNITED .STATES PATENT OFFICE warm s. man, or snonnwoon, vv'rsconsrla, assrcnon, Bjr .man nestenmrs, 'ro 'rmil minnen comm, or wmmaron, DELAWARE, a couronn- TIOI I DELAWARE sranrnm mwlcn lron. synchronous no'rons origini nl. ananas, ma number as, mo, serial n. 080,642, mea member 14, 1m. application for reissue tiled January 28, 1931.

of the motor. In the past this has been ac `complished by an operator manually closing f' the various circuits at intervals, often re-.,

l sulting in improper starting and necessitating repeating of the starting operation, as it is essential that each step 1n the starting cycle be made in its proper sequence with the -proper time interval between it and the 3 preceding step. As a result of the obstacles v and diliculties experienced in the manual starting of synchronous motorsci Ihey lave ave een not been generall adopted, an Aviewed with considerable disfavor.

With the above and other objections in mind,` this invention has forl one of its objects to provide a startin device for synchronous motors wherein t e human element Y is absolutely eliminated and all the opera- V-ti'ons of the starting cycle performed automatically after an initial starting switch has been closed. v

Another object of this invention resides in the provisionof a starting device for synchronous motors wherein a prolonged excessive overload or the failure of any of the steps in the cycle renders the entire device ino 'rative y e in the starting of a synchronous motor only alternatin current is used u the time the motor isllirought to speed, 1t- 1s advisable to have both the alternating and direct currents at the board when the initial -Y step ofthe startingcle isA rformed to the possibi y of ringing the motor up to speed and not belng able to com lote the cycle due to the current not ing on the board when it 1s to be connected with the rotor.

' w f n is, therefnre, maar abject ofnnn in.v

`erning relay and the closing of the direct' Berill IQ. 510,835.

vention to provide a starting device of the character described wherein it is im ossible to startI the starting cycle unless bot alter-v nating and direct current are at the board.

Another object of this invention resides in i the provision of means operable up'on the failure ofv any one step in the starting cycle :to be completed in its sequence and within a predetermined time interval, whereby the entire starting operation is rendered inoperative.

' A' further object, of this invention resides in the provisionioi means for producing a time lag between the actuatin'g of the govcurrent main switch for connecting the direct y current with the rotor after the motor has been brought to speed whereb the overning'relay may be set at a su cient y high a ue to at all times insure the direct current going on.

And a still furtherobject of this invention. resides in the provision of a compound governinglrelay having a coil of a constant value and a coil of a varlable value and responsive ltothe current consumed by the motor during the riod when the same is vbrought to speed.

ith the above and other objects in .view

. which will appear as the description proceeds,

my invention resides in the -novel construction, combination and arrangementof parts substantially as hereinafter described and more particularly defined by the appended claims, it being understood that such changes in the'l precise embodiment of the herein disclosed invention may be made as come within the scope of theclaims.v Y

In the accompanying drawings, I have illustrated one complete example of the physical embodiment of my invention constructed according to the best mod e I have so` far devised for the practical application of the principles thereof, and in which: l f

Figure 1 is a, view in front elevation of the panel or freht switch board of a synchronous motor starting device embodying my invention Y v Figure'2 is a front elevation of a compound governing relay employed in connection with my improved synchronous motor starting'y vals circuits employed.

devlce;

Figure?, is a side view thereof; Figure 4 isa diagrammatic showingof the Referring now more particularl tothe drawlngs in which like numerals' esignate hke parts throughout'the several views, the numeral 5 designates the rotor and 6 the stator of a three phase synchronous motor.

which is diagrammatically illustrated in B ig-y ure 4. j

Heretofore the 'starting of a synchronous motor 'has been chiefly accomplished by the' fare, wound magnetic coils 50 and 5 1 respecf tively.;l Positioned medially-'of the cores or pole members-46 and 47 Ais a .pivotfstandard 52]V to which :the armatures 53 i'and- '54 for `the manipllation of various switches, the '1nter`V tween the manipulations of' 'which have been controlled bythefoperator, bringing intro play the' humangelement which 'is' objectionable in that the intervalsbetween the closing of the various circuits are varied.

This invention contemplates the elimina-' tion of the human element as a factor in the starting operation of a synchronous motor,

gageable with fixed contacts 38"an'd39, `re'-v by providi a single starting switch or but,vkllv ton S whic closes .an initial circuit to be later described, resulting in the actuation 'in' proper sequence and atthe desired intervals of a plurality of actuating devices insuring the proper protection a t overload a failure of any of thevdevlces to operate at lthe proper time up to the point 'where the motor is in full operation with the alternating 'cur-v rent at the stator and the direct current 'at the rotor.

This invention, as

. mounting a direct current'ammeter 8,'an al-` v line switch V12, a start button S, a stop-button ternating current ammeter 9, a rheostat' 10,

an indicating light 11, a direct current main S', an initial control, direct current, magi* netic switch 13,'an 'alternating current,.relay' timing` relay 18 and-two overloa switch 14, a compound governing., relay switch 15, an alternating current, relay switch 16, a dinect'current actuated, timing relay 17 an alternating current dprotective,

rela s 19, and 20.` The rear panel has mounted t ereon a direct current magnetic switch 21 which controls auxiliary switches 22 and 23, a resistance cutout switch 24, a resistance 25, an

toward the coil by its ener 'zation,' engages amovable contact carried y 4the amature with a fixed contact 33. The magnetic switch 1'47`is lalso 'of 'conventional construction Vincluding a magnetic coil 34- and a 'movable' armature 35 adapted to be attracted thereto illustrated, employs a front board or panel 7 anda rear boardz or' panel, notv shown, the front board or panel 1 57 carried by'the j armatures, a setting bolt or screw- 58 cooperating with the fastening member56 and permitting aline adjustment of the" 'g angle between the armatures to vary the sen-v sitiveness o'f the vmagnetic switch, as will be ture 54 towardfitsf magneticcoil may be ad- Aas will bevr'eadilyapparent'. The outer end, `ofthe armature 53carries' a movable contact which is adapted to ven'gag'e`- a' fixed conif v tact 61 when the 'armatures )are in'rtheir posi-v 'secured by 'a' pivoter); f

spectively.- The magnetic switch 1 6 is similar? in construction tothe magnetic switch 14 and zcomprises a magnetic' coil 40,` a movable ar-'1 mature 41 controllin'ga pair'of movableconf 'tacts 42 and, 43l which are engageable with a; x

aligned l`'co-re or. pole members 46 and' 4 7 fx around the opposite ends 48 land 490i which coils 5'() and l'respectively, are, pivotally The armatures 53 a'nd`54 are conl nected at an angle with respect to each other r by a bolt or otherfastening member 56 which passes through la'iteralV projections vor: anges later described,` 'The movementfof the armajusted by 'a" set screw '59" passing through the end thereof' and adaptedtjo'rbutt thecore 49,

' by an armature 65 with one end O which vsuitadapted to be attracted thereto-and carry- 'ing armature 32 adapted to, upon attraction i The'relays'lf?, 18, 19 'Mld'.20are movable contact '63. adapted tofb'ridge con- I* tacts 64, the movable contact bein controlled pairof fixed Vcontacts 44 and 45,' respectively. The compound governing vrelay-switch 15 construction illustratedin Letters Patent N o. i v

able dash pot means,not shown, areconnected. Each of the relays 17, 18, 19 and 20 are identical in structure withl the exception offrelay 17, the contacts 64 of which are normally open and only close'upon loperation of 1 the rela,' l The 'rect current magnetic switch 21 cub' bodies a magneticcoil .66', and an armature ing a air of movable contacts 67 andl68 1 'adapte lto engage stationary contacts 69 and 70,2res c'tively, when` the armature 66' is at#l the movable ar'matl'lrel to disenga'ge'mo'w l able contact 71 fl 0m '.the-.stationaryfcontact Y g 72 when said direct currentmagnrgg Witchf a is closed and to yclose said vauxiliaryy contacts when'th'- direct gli' is opened. The aunIiaryvswitch is' l l at the A.

. down the volta similar in construction to the auztiliaryswitch l22 and embodies a movable contact ([3, which is controlledv from the magnetic switch armature 66, and a fixed contact 74. As the operation of this auxiliary switch is identical with that of the auxiliary switch 22, furtherl description thereof is deemed unnecessary. The

resistance cut-out switch 24 is of similar de sign, comprising a movable contact which is in' etfect'the continuation of the movable .contact 67 and which is engaged with a fixed when the amature 78 is deenergized. The

auxiliary switch 27 is controlledv directly from the armature 78 and includes a movable contact which is actuated by the armature 78 to bridge a pair of fixed contacts 86 when the armature 7 8 is attracted to its coil 77. l

The alternating current is led to the fixed contacts 82, 83 and 84 by three service lines l87, 88 and 89, respectively, and the alternating current is connectible with the fields of the stator upon closing of the alternating current main line switch 26 through the conductors 90, 91 and 92 leading from the movable contacts 79, 80'and 81, respectively. The direct current is led to the fixed contacts 93 and 94 of the switch 12 on the mainswitch board or panel by the service lines 95 and 96, respectively, and the movable .c contacts 97 and 98 of the switch 12 are connected with the fixed contacts 69 and 70 of the direct current magnetic switch 21 by conductors 99 and 100, respectively, the rheostat 10 and the direct current ammeter 8 being lconnected in on the conductor 100, -as clearly vdepicted in Figure4. The direct current is thence connectible with the rotor 5 of the motor when the direct current `ma etic switch 21 is closed, through the con uctorslOl, 102 leading from the movable contacts 67 and 68, respectively, to the rotor. 1

The volta e in the embodiment illustrated, .service line is extremely high and for this reasonit is desirable to step -of the current used at the switch board or controlling the various magnetic switches. To this end the transformer 28 is provided and vone end of`its primary coil 103 connected with line. 89 by a conductor 104 and the other end thereof connected lwith line 88 by a conductor 105, suitable fuses 106 being provided within the conductors 104 and 105 to provide a factor of safety. The secondary coil 107 of the when the with one end of a fuse v'108 mounted lon the front switch board by a conductor 109 and has its other end connected with one end of a fuse 110 mounted on the front switch board 'v by a conductor 111, thusA bringing the alternating current of'low voltage for operation of the alternating current actuating mag- `transformer 28 has 011e end thereof connected l i netic switches to the front switch board.

With the circuits as illustrated in. the drawin s, the alternating current is brought to the uses 108 and 110, and all of the controlling devices are inoperative.- Switch 12 is first thrown in, engaging the movable contacts 97 and 98 with the contacts 93 and 94 illuminating the indicating light 11 which is connected across the contacts 97 and 98 by conductors' 112 and'113, the direct current being advanced to the contacts 69 and 70 of the magnetic switch 21, andthe coil 31 of the switch device 13 being energized b reason of one end thereof belng connecte with i the contact 97 by a conductor 114 connected with the conductor 112 and a conductor 115 which is connected with a conductor 116, connected to the contact 98, enga ing the contacts 32 and 33 sol that. upon t e manipulation of the starting button S to engage the movable contact 117 thereof with the fixed contacts 118 and 119 thereof, the coil 34 of the magnetic lswitch device 14 is energized engaging thecontacts 36 and 38, 37 and 39,. respectively. The circuit of the coil 34is then from the fuse'108 through the conductor 120, contact 119, contact 117, contact 118,

conductor 121, contact 122, the stop yswitch andcontact 123 thereof, conductor 124, con'- tacts 33 and 32 on the switchdevice 13, conductor .125,4 through the coil 34, conductor 126, contacts 64 and' 63 of the protecting relay 18 and the overload relays 19 and 20, one contact 64 of the` protective timing rela 18 bein connected with one contact 64 o the over oad v relay 19 by a conductor 127, one contact 64 of the overload relay 19 being connected with one contact 64 ofthe overload relay 20 and thence to the fuse 110 through a conductor .129 connected with 'the otherl contact 64 of the overload relay 20.

The stop switch is of the normally closed type and the starting syvitch of the normally open ty button permits its movement to openz posie and a release of the pressure on the,

tion as a result of which the circuit of the coil .34 is then through-the conductor 120, contact 119 of the start switch, conductor` 130 which is connected. with the movable contact 37 of 'the switch device 14, conductor 131 which leads from the movable contact 37 to the movable contact 36, contacts 36 and 38, cbnductor 132 connectin the contact 38 with the contact 118 and thus t lrough the stop switch and the remainderlof thecircuit previously described.

As stated, immediately upon the energizetlon of the coil 34, contacts 36 and 38 and 37 and 39 'aremade, as'aresultfofi.'wh1

. l'the mag1`1et'77 .ofthe main .line alternating currenti switch- 26 is energized,fthe circuit' thereof being" closed through favv conductor 133 leading 'from the fuse 1310, lto "one `lend Y Vof 'the' oil-77, through the coil a conductorv 134g-copnecting theother Y@ url- 0f .the coil with vone contact V86 ofvthegauxiliary switch'27 through a conductor v1353jleading from the contactf86, through a conductor. 136

leading from'th'e conductor `135150 the contact v1.3.9, contact 37, thence tothe fusev 108 through theconductor 130, contact 119 and conductor 1 [120, closin the switch26 to engage its con 'tacts V'7 9 an 82, 80'and'83and 81 and 84, and

'connecting'ithe stator' of the motor with the` ""A..C. line,the circuits being through conducf Q tor. 87, 'contacts82and 79 yand conductor'90 to and throughv conductor 91VV to the stator, kconythe coil 40,"conductor 137,l conductor 138,

" s 'through vcontacts72'and 71 ofthe auxiliary switch 22,'conductorj139 audthence to the 110,-through the conductor 133, closing the' contacts 4 2-and44', 43 and 45.

by the mov-k ablek contact '85, the circuit o the protective relay 18 is closed through conductor As the contacts 86 are brid i' 120, contact v119, conductor .130, contacts 37 and 39, conductor-136,.conductor 135, the auxiliary switch 27, conductor 140,"throu'gh f the coil 62 of the relay 18, throu h conductor i 113s, auxiliary switch' 22, of the vrect-.current magnetic swltch, conductor 139, thence to the fuse 110through conductor 133.V V'111e current transformers f 29 and 30` are connected by a common conductor` 141 with* the. ground G the movable contact 42 of the control devicel 16 by a conductor'143, .the contacts 42and 43 i' and to a conductor 142fwhichleadsteoneend ofthe coil 51 ofthe governing'relay device 15, the other end ofthe coil bei-ng connected-with being connectedbya comxn'ouconductor 144 and with oneside of ammeter t9 by a conductor 145,1the otherf'lside of the.

' ammeter being connected b a conductor 146 with the' coils 62 of the over .oad relays 19 and layfeo connected withvthevaationa'ryr contactby a conductor 148. The contactsY 44' and. 45 are 'connected with'the othersides 20, the otherside .of the oyerlo'ad relay 19 connected with the stationary contact bei '4 4 5% the deviee'- 16 by a conductor l147. and the other'side ofthe c 'oil 62 o f. the overload reofthe transformers 29 by conductors is energized#- continuitgrgf the circuit of the coil i 66 but conductor 158. b

other end of w 'ch is connected -with thev the magnetic switch `16 i The .coil51 thus .energiz'ed "andthevalue of.l the current. iowing therethxjoughv is iin proportion. [to Y the' value lof the current'taken by the starting action f of the motor which is ve start "and decreases. as t e; motorf'speed increases. The .coil of the jdevicey 1'5 is .also

highttthe. initial energizedits circuitbeing-frnm thefu'se 110 I through the conductorfll, through the ."coil .'50, through conductor'152,throu h conductor 140, through the auxiliary swit 27, conducto r 135,' conductor-'136,' rcontactfst'39 and 37 i conductor. 130, contact-f 119 audio. the fuse.

" the currenttsupplied: `.the vcoil 50fis constant land as the strength of' the coil 5,1` isextremely -high 'during the starting o fjthe motoraszlfml);

viously- "described,fthe armature 54 wi attracted tothe coil l'fagans't the pull exert-v ed fon the armature 5 3 :by the'pull of the coil 50 andas the-"motrgcomes to speed and thegl stren h off-the' coil ,51".falls, armature 5 3 will t en be pulled Yincl'osing the'contacts 60 and lclosing the circuit'of. .the coil 62 of. the current t 1 61 and 60, conductor 153,"throughthe'coil 62 relatylywhich. is operated by direct oug theconductor 116, contactsl of relay 17 andl back tothe other. side `ofthe 'line through a conductor 154 connectedwith Y the switchcontact 97.@y Y f After? the interval: of several seconds, ac. cording= to the adjustment ofthe .timing re-v lay 17, contact 63 is engaged-with the contactsV the samefasf a' result .of which f f ef-bridging e directl current ma etic switch 21 is. energized, clon'g the-d1 ct current to the rotor throu hthe contacts'69 and67, l' conductor 101 Vvau through the :coutacts70 and 68 landconductor 102,311: the same time 11o.

opening the contactsfj75andf76 of the auxiliary switch24, opening the resistance .25

which hasjbeenin the rotorline to prevent lthe buildinginthe rotor of a. high voltage and also breaking thel contacts 71 and 72 of the auxiliaryswitch. l22 and .contacts 73 rand 74'of the auxiliary switch 23.. f 1

The circuit 'of the coil? 66when energized is throu h thejswitchgcontact 97,7conductor.

154, con uctor 155, contacts'63, and 64 ductor 156, -throughthe coil v 66' hrough the f conductor 157, vthrough vthe'tuixiliary switch' 23 conduct'orf158 `to -the other contact 98 thev auxiliary'. switch 2 3 .does v-not reak the merelyt ws into the circuit a resistance a through the conductor 116. l The yo ning of 159', one end'of which is connected with the v a. conductor 160 -and the.

conductor 157 by a conductor 161;.

. '.The.. opening of the auxiliary-miren 22.

' tion refer to an arrangement-wherein the direct current line when breaks the continuity of the magnetic coil 40 as a result of which the overload relays-19 and 20 are thrown into the lineas well as the alternating current ammeter 9 and the motor is then runnin at full speed under normal conditions. T e opening of the auxiliary switch 22 also cuts out the protective timin relay 18, one side of' which is connected with conductor 138, as` previously described. Q

While the drawings and the above des'criilrect current is obtained from an external source, it will be apparent. that this invention may be employed without au change, with a synchronous motor of the sel'f-excited type, i. e., one having means such as av conventional exciter, not shown, for generating and delivering its own direct current to the leads 95 and 96. In this structure therelay switch 13 is eliminated and the relay 34 then'directl connected with the contact 1 23 of the stop switch. It is a well known fact that the voltage of the direct current generated in syn-A chronous motors ofthe self-excited type is not built up simultaneously with the`coming to speed of the motor andfor this reason -a time lag must be provided between the time the motor comes to speed and the time the direct current is connected with the rotor 5. This time lag is provided by the timing relay 17. l

By reason of the angle between the armatures 53 and 54 of the governing relay 15 being adjustable, the response of this relay to the condition in the alternating current line isreadily adjustable and the period at which the contacts and 61 close controlled. The rheostat 10 may be eliminated, if desired, as the same is only incorporated in thespecilied by the customer.

From the fore oing description taken inv connection with te accompanying drawings, it will be readily obvious that upon failure of any one of the devices in the starting cycle. of the motor the entire starting operation will Vbe thrown out in a predetermined time and it will be necessa to` again start at thel beginning. Further t at it is im ble to i complete the initial step in the cy e without ing the starting period, whic is the period having both Yalternating and direct. current at the board. l

With this scheine of control is lprovided a means whereby the voverload relays are .inserted into the circuit only. after the start has been completed whichperinits a closer setting on the same giving better protection to the motor. At the same time a protective timing relay isV built into the control which will disconnect the motor from the lin'e in case the start hasnot been completed in a predeinterVaI.' 'As is understood, type'of control does not give rotection durto speed and if this is not accomplished the control is brought'to the off position.`

The starting device illustrated also provides a means through Va timing relay 17V whereby a lag is introduced between the operation of governing relay 15 and magnetic switch 21. This timerlag has the value in that it allows a setting on the governing relay 15 which assures its operation providing the motoncomes to speed, by giving the motor additional .time to come near synchronous speed after the governing relay has operated,

and ina self excited motor gives the D. C.

generator additional time in which to build up its voltage.

What I claim as m invention is:

' 1. An appliance o` the character described,

comprising a synchronous electric motive ma' chine having a direct'current supply circuit for the field, a plurality of automatic devices ada ted to be operated by the direct current, a. p urality of automatic devices adapted to be operated by alternating current, a plurality of electricalcircuits including the automatic devices and adapted to be lclosed in sequence at predetermined intervals to eect the starting of the machine, a starting switch adapted to be actuated to close one of the circuits to eiect the automatic actuation in sequence of said devices, and means operable upon failure of any of said automatic devicesto actuate within a predetermined period of 'time'to render inoperative all of said devices which are inoperative position.

2. The combination with a synchronous electro-motive machine adapted to be started by lhaving alternating current applied to the statorthereof aud to have direct current applied to therotorafter the motor has approached synchronous speed, of a governing relay controlled from the alternating current .supplied the `stator at a voltage derived from the stator circuit, a timing relay, a circuit including said relay and said govern.

ing relay, said governing-relay being actuated upon the machine approached synchro-` speed to throw in the circuit of said tim- Y nous O in re 'dmeans actuated by said timing after the 'actuation of said governingY relay re y Wallin n predeamnedperiod of time 1 to connect the direct current with the rotor,

said timing rela tween the time w en the mac' e approached synchronous speed and the direct current is connected with the rotor thereof.

.3. The combination with a synchronous motor adapted to be started by having alternatmg current applied to the stator thereof andto have direct'current applied. to the rotor of the motor afterthe motor has a preached synchronous of a governinlg relay controlled 'from t e alternating 'current supplied the stator ofthemotor, a

f3 r'otective timingiiito the circuit of said-magnetic relay' dati@ l 'v ci'tation circpit and? saidcontrol lfandaincluding means for closings'aid excitation circuit; meansfincluded in Said control- 're lingeiruiafor c1 said imei-medina cir.'

said

*fins mldy sndrssd wlmi- .Sid-

@ve-name bein coated #heim-f approaching Async ronous `throw motor adapted `to'be by ha vnatingcurrent appliedto the'statort ereof :tdhave directcurrentapplied to the rotor of the motor after the motor has approached synchronousspeed, of a mainline alternatin'gcurrent magnetic switch adapted in the circuit of said relay, means actuated b said timing relaylyvithmf-a pre? .determine l,period ottime after-1116.A actua-5v ytion vof sai'd'governing relay to, connect di# y rect current with'the rotor, saidtimin'glc-v` 10 a andthe'direct; current is connected j .f'with-fthe rotor thereof, and `means operable" to disconnect -the alternating current. fromjf the statorvof the motorupon theffailureofg rect current to jbe lsupplied the` rotor witliin a redetcrmined period of v--tiiner 4.' e .acomb'nationfjwith vla' nating currentlapplied tothe thereof 'i r0tor ofthe mltor vajfterztlrle motor baseppreached 'synchronous` speed, `of ai in ainZ 'line alternating current magnetic' magnetic relay switch adapted to, .upon ac tuation', closesaid.' mentioned-circuit and lactuate the main-line an overload Vre1 i lay within the circuit offsaidvmagneticrelay .switch v'and voperablefupon the' occurrence' of Jj statorjrom its source ofja'lternatingcurrent.-

' -w and means operableduring the'entineaperiod .the motor. is beingbrou tto 'speed-fo.' '-161,1'. 'der said overload 4relay inoperative.v i

l 1 5. The combination'. with; a.1 synchronous motor adaptedto belstartedbyhaving'alter.-

.rotor of the inotor-'a'fterthe motor has ap preached synchronous speed, of-ja, mainlinev alternating zu'rrent magnetic switch adapted...

" .sourga of. alternatin current, Va vcir :`l1i t. i.nfv

clu'dlng 'said '.main'- line. 'magnetic 'switclffa magnetic relayswitchadapted to, upon actuder said 'overlca relayjlnoperativfe, Y"a'nd.g} a" dm periodfsaidf'overload relay-laren'- `dared inoperative whe'mby the ;.e ncinuity la AYproviding atime .lagfbetween the ,time w the 'motor' pprwhes synchronous] 'Source of alternatin c1ud ing .said main linermagnetic switch, a magnetic relayswitch adaptedto upon lactumotor adapted tobe'started byflhl vingalter- 2Q :und to have' I direct current .applied Vtoj-the ation, .clem-.Saidiirst; mentioned circuit;` te actuate the lnainl line'switch'," 'an ovgnfloadf` relay, within :the circuit Lof said. magnetic-f ity of the circuitthereof and thel @motor stator from-lits source o f`. alte1'1 rating`j.:l

current,means. operable during theperiodf the .motor isbein lbrought-to"speed tofrenf excitation circuitincluding'a supp i a-normallyo n'` controlling rcircu' ltherefor Y and in ara eljthe'rewith; 'a normally open "of: of said magnetic relay delviee' is broken the stator from of u" n the failure of to connect-.the stator of the motor with a current, a circuit invrent,vmeans operable during the period the motor is being brought Ito speed'to'frendcuv said overload relay* ino rative, a protec- 95V to the'. stator of. the motorilwith afl source of alternating current,v a'-ci rcuit in-rv cludingsaidmain line.l magnetic switch', a..

Vtive timing relay adapte to be throwninto thevc'ircuit of saidy magnetic-relay device `r( luring the period said overload-'relay is rendered inoperative whereby the continuity failure Yof the motor to cometo spee ,withina.predeterminedv period of time, a direct current magnetic vswitch Vadapted to, upon being closed, connect the rotor v015 the motor rent magnetic switch.)

and vin. parallel therewith; a noifmally open and `with saidcontrolling circuit, fand includ:

ingfnieansorflosing s aid'excitation circuit ;'v

means said cmiirolling circuit for closi saidla'stnamed circuit av manually close vexcitation circuit. e i

interme iate vcircuit in parallel with said ex circuit,- 1

10a .j with a source' of direct current, and means operablewithin a predetermined period of 'time after the motor has approached synj f cli-ronousi'speed for closing. said 'direct'.curf

.. .105.. y 1j-7. Automatic starting means for-'synchronous lnotors',comprisin'g; anormally open ex- .citation circuit' including-a supply ISource' a 'normally open controlling circuit .therefor "motors; an excitation circuit including a sup'- cuit; a manually closed motor actuating circuit; means influenced by the current'in said motor actuating circuit for closing said controlling circuit and a normally closed circuit in parallel with said excitation circuit for rendering said manually closed. actuating circuit operable. v l

9. Automatic starting means for synchronous motors, comprising' an excitatlon circuit open at a plurality o points and including a supply source; a normally open controlling c1rcuit therefor and in parallel therewith; a normally open intermediate circuit in arallel with said excitation circuit and sai controlling circuit, and including means for closing said excitation circuit; means ,in

said controlling circuit for closing said intermediate circuit; a motor actuating circuit;

manually operable means for eii'ecting the closing of said actuating circuit; means in`-, luenced from sald motor actuatlng c1rcu1t for closing said controllingcircuit; one of the open points of said excitation circuit being .manually closable; a shunt circuit including said supply source and closable by the closing of said manually closable point inthe excitation circuit, and including means for rendering the operation of said manually closable means for the motor actuating circuit effective only when thev shunt circuit is closed.

10. In an automatic starting system for synchronous motors; a motor actuating cir'- cuit; manually operable means for effecting .l the closing thereof; 'an excitation circuit; a

shunt circuit in connection therewith; and

means in saidv shunt circuit for rendering said manually operable means effective only when said shunt circuit is closed.

' 11. In a starting' system forv synchronous motors; an excitation circuitincluding a sup- 1y source; a controlling circuit therefor and i 1n parallel therewith; a motor'factuating cirgoverning circuit including both a secondaryv cuit means inll'ue'nced from said motor actuating circuit and biased thereby-to Yclose said lcontrolling circuit; and meansresponsive to current consumed by the motor actuating circuit -for counteractmg the bias vofmsaid `first named means until the motor approaches synchronous speed.. Y

12. In a starting system-'fuorf-synchronous motors; an excitation .circuit manually closable to include 4asu ply source; a controlling circuit therefor an in parallelv therewith; a transformer; `a motor actuating circuit including the primary ofsaid transfonner; a

of said transformer and means :for closing the controlling circuit for said excitation cir-' cuit; and means operable only upon closure of saidl excitation circuit to include the supply source, to efect. the'closing of said. I Ilolh'A actuating circuit.

V13; In a st system for Synchronous A ply source; a 'controlling circuit for said excitation ci'rcuit and in parallel therewith;

a motor actuatin circuit including a motor; means inlluenc u I) cuit'and biased thereby to close said controlling circuit; means responsive to current passing through the motor in said motor lactuating circuit for counteracting the bias y said motor actuating cirof said first named means until the motor approachesl synchronous speed; and a timing relay in said controlling circuit for closing said excitation circuit. y

14. In a starting' system for synchronous motors; an excitation circuit including a supply source; a controlling circuit for said excitation circuit and in 4parallel therewith; a

motor actuating circuit; means-inductively,

controlled by a-circuitin parallel with said motoractuating circuit and biased to close said controlling circuit; and means inductive ly responsive to current consumed by the motor actuating circuit, and operative to counteract thebias of said biased means until the motor approaches synchronous speed.

15. `Automatic starting means for synchronous'motors, comprising; an excitation circuit including a supply source and a plurality of switches; a circuit for controlling said excitationcircuit, in parallel therewith and including a switch; an intermediate circuit Ain parallel with both said excitation circuit and synchronous speed; and a shunt circuit connected with said excitation circuit and including means for rendering thevoperation of all of said circuits and means ineifective until said shunt circuit is closed.

In anl automatic starting systeinl for iis synchronous motors; a motor actuating circuit including a switch; a circuit inductively connected with said motor circuit and including means for operating said switch; an excitation circuit; acircuitv in parallel connection with said inductive-circuit and including means lfor veffecting the 'closing of said excitation circuit when the motorvapproaches. synchronous speed; a controllin circuit in parallel connection with both o said inductive circuits; anda protective circuit in parallel. lconnectionA with all of said vinductive circuits and .including time relay.

`,' 17.111 'a staren tion circuit fo' opelilsud vprotectivecirclilit;

sysenffor Synchronous! motors including .a terngtingandrdirectour'- 1 i ffmeanso' ateby y switfch in .lg thef-altenatin 'current' f' source, aymgmually winding when v"I nosol:ipp

h 'v onse to thegovplebe t sa oto for"ontrol1ng Y rel yforbpening' eulfsrexlji:y flows` toii'.V fox-,said 'overload' Varmature supply,

d VSwitch and vcir'eit' closer be n for @man inging-matar and lm1-gu line,v electro-nes'po'l'gsi've` grr said leccrofre'spons-ve means, said f' capable.Y of completion iionor-J` Mixed "my Sizgnture i lkcontrl'lling the operation of :miaol'nxitie':vv vim actuating circuitiv for e lc'xonnection of said" lfieldl winding toy said'direet curren v 1;'

` sourde, the sidgdeviee being .provided y'with -i' vvmeans .eontrolledbf 'theimotor for` regulat l the timing'y Lthere'o "tof-effect [said y eonnecti 

